name: Update FrogPilot Branch

on:
  schedule:
    - cron: "0 18 * * 6"

env:
  GITHUB_TOKEN: ${{ secrets.PERSONAL_ACCESS_TOKEN }}

  BRANCH_FROGPILOT: FrogPilot
  BRANCH_PREVIOUS: FrogPilot-Previous
  BRANCH_STAGING: FrogPilot-Staging

  TZ: America/Phoenix

  UPDATE_FILE: .github/update_date

jobs:
  check_update:
    runs-on: ubuntu-latest
    outputs:
      update_due: ${{ steps.check_update.outputs.update_due }}
      scheduled_date: ${{ steps.check_update.outputs.scheduled_date }}
    steps:
      - name: Download the "update_date" File
        id: download_update
        run: |
          curl -fLsS "https://raw.githubusercontent.com/FrogAi/FrogPilot/${{ env.BRANCH_STAGING }}/${{ env.UPDATE_FILE }}" -o update_date || touch update_date_missing

      - name: Check If Update Is Due
        id: check_update
        run: |
          if [ -f update_date_missing ]; then
            echo "update_due=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          SCHEDULED_DATE=$(cat update_date)
          CURRENT_DATE=$(TZ="${{ env.TZ }}" date +%F)

          if [ "$SCHEDULED_DATE" != "$CURRENT_DATE" ]; then
            echo "update_due=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          echo "update_due=true" >> "$GITHUB_OUTPUT"
          echo "scheduled_date=$SCHEDULED_DATE" >> "$GITHUB_OUTPUT"

  update_branch:
    needs: check_update
    if: ${{ needs.check_update.outputs.update_due == 'true' }}
    runs-on: ubuntu-latest
    steps:
      - name: Configure Git Identity
        run: |
          git config --global user.name "James"
          git config --global user.email "91348155+FrogAi@users.noreply.github.com"

      - name: Checkout ${{ env.BRANCH_STAGING }}
        uses: actions/checkout@v3
        with:
          fetch-depth: 0
          ref: ${{ env.BRANCH_STAGING }}

      - name: Authenticate with GITHUB_TOKEN
        run: |
          git remote set-url origin https://x-access-token:${GITHUB_TOKEN}@github.com/${{ github.repository }}

      - name: Update README Date and Remove update file
        run: |
          DAY=$(TZ="${{ env.TZ }}" date +'%d' | sed 's/^0//')

          case "$DAY" in
            1|21|31) SUFFIX="st" ;;
            2|22)    SUFFIX="nd" ;;
            3|23)    SUFFIX="rd" ;;
            *)       SUFFIX="th" ;;
          esac

          MONTH=$(TZ="${{ env.TZ }}" date +'%B')
          YEAR=$(TZ="${{ env.TZ }}" date +'%Y')

          DATE="${MONTH} ${DAY}${SUFFIX}, ${YEAR}"
          DATE_ESCAPED=$(printf '%s' "$DATE" | sed -E 's/ /%20/g; s/,/%2C/g')

          sed -i -E "s|(Last%20Updated-)[^-)]*|\1${DATE_ESCAPED}|g" README.md

          git add README.md
          git rm -f "${{ env.UPDATE_FILE }}"
          git commit -m "Updated README date to ${DATE}"

      - name: Squash Commits
        run: |
          COMMIT_MSG=$(git log -1 --pretty=%B HEAD~1)

          git reset --soft HEAD~2
          git commit -m "$COMMIT_MSG"

      - name: Rewrite Commit Dates to Noon ${{ env.TZ }}
        run: |
          COMMIT_DATETIME="${{ needs.check_update.outputs.scheduled_date }} 12:00"
          COMMIT_PHX=$(TZ="${{ env.TZ }}" date -d "$COMMIT_DATETIME" +"%Y-%m-%dT%H:%M:%S %z")

          git filter-branch --env-filter "export GIT_AUTHOR_DATE='$COMMIT_PHX'; export GIT_COMMITTER_DATE='$COMMIT_PHX'" "${{ env.BRANCH_STAGING }}"

      - name: Fetch ${{ env.BRANCH_PREVIOUS }} and ${{ env.BRANCH_FROGPILOT }}
        run: |
          git fetch origin ${{ env.BRANCH_PREVIOUS }} ${{ env.BRANCH_FROGPILOT }}

      - name: Wait Until Noon ${{ env.TZ }}
        run: |
          NOW=$(TZ="${{ env.TZ }}" date +%s)
          TARGET=$(TZ="${{ env.TZ }}" date -d "12:00" +%s)

          [ "$NOW" -lt "$TARGET" ] && sleep $((TARGET - NOW))

      - name: Push ${{ env.BRANCH_STAGING }}
        run: |
          git push origin "${{ env.BRANCH_STAGING }}" --force

      - name: Reset ${{ env.BRANCH_PREVIOUS }} to Match ${{ env.BRANCH_FROGPILOT }}
        run: |
          git switch "${{ env.BRANCH_PREVIOUS }}"
          git reset --hard "origin/${{ env.BRANCH_FROGPILOT }}"
          git push origin "${{ env.BRANCH_PREVIOUS }}" --force

      - name: Reset ${{ env.BRANCH_FROGPILOT }} to Match ${{ env.BRANCH_STAGING }}
        run: |
          git switch "${{ env.BRANCH_FROGPILOT }}"
          git reset --hard "origin/${{ env.BRANCH_STAGING }}"
          git push origin "${{ env.BRANCH_FROGPILOT }}" --force